westcott



4 Sheets-Sheet 1.

(No Model.)

J. H. WESTOOTT. LATHE CHUOK,

No. 470,370. Patented Mar. 8,1892.

WITNESSES:

INVENTOR ATTORNEYS.

(No Model.) v 4 Sheets-Sheet 2. J. H. WESTGOTT. LATHE CHUCK No. 470,370.Patented Mar. 8, 1892.

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ATTORNEYS.

INVENTORI /;%M%Z2y22:

S E S S E N T W (No Model.) 4 Sheets-Sheet 3.

J. H. vWESTOOTT.

LATHE CHUCK.

No. 470,370. Patented Mar. 8, 1892.

. INVENTOR- 4 ATTO RN EYS.

WITNESSES;

(No Model.) 4 Sheets-Sheet 1.4,

J. H. WESTCOTT.-.

LATHE CHUCK.

No, 470,370. Patented Mar. 8. 1892;.

WITNESSES: w IN-VENTOR Oz. QZLMWM), M /%%M %QMW, :z/ 2' PM A; ATTORNEYS.

UNITED STATES PATENT OFFICE.

JAMES H. \VESTOOTT, OF ONEIDA, NEIV YORK, ASSIGNOR OF ONE-HALF TO THEWESTOOTT CHUCK COMPANY, OF SAME PLACE.

LATHE-CHUCK.

SPECIFICATION forming part of Letters Patent No. 470,370, dated March 8,1892.

Application filed October 14, 1891. Serial No. 408.666- (No model.)

To all whom it may concern:

Be it known that I, JAMES H. Wnsrcorr, of

. Oneida, in the county of Madison, in the State of New York, haveinvented new and useful Improvements in Lathe-Chucks, of which thefollowing, taken in connection with the accompanying drawings, is afull, clear, and exact description.

This invention relates to the class of lathe or drill chucks which havethe jaws pivoted eccentrically, so that their hold on the drill or workis automatically strengthened accord ing to the strain exerted on thedrill or work.

The object of this invention is to afford to the pivoted jaws greaterrange of adjustment by simple and efficient means; and to that end theinvention consists, essentially, in the combination, with thechuck-body, of j aw-carriers arranged adjustably in their distance fromthe axis of said body and jaws connected to said carriers revolubly onaxes parallel with that of the body, and the invention also consists innovel features of the details of the chuck, as hereinafter more fullydescribed, and set forth in the claim.

In the annexed drawings, Figure 1 is a face view of a chuck embodying myinvention. Fig. 2 shows the same with the end cap removed. Fig. 3 is aside view of the chuck. Fig. at is a longitudinal section on line 0000,Fig. 1. Fig. 5 is a detached perspective view of one of the jaws and itscarrier. Figs. 6 and 7 are transverse sections, respectively, on lines 3y and z z,Fig. 4. Fig. 8 is a longitudinal section of a modification ofmy invention; and Fig. 9 is a transverse section on line 0 0, Fig. 8.

Similar letters of reference indicate corresponding parts.

A represents the chuck-body, which is provided with the radial ways or aa, in which are seated and guided the carriers O O O, which are arrangedadjustable in their distance from the axis of the body A. Saidadjustment may be effected by means of screws 19, journaled in the bodyA parallel with the aforesaid carriers and engaging nuts orscrew-threaded portions n on the carriers, as shown in Figs. 4 and 7 ofthe drawings, and in order to render the jaws universally adjustable thescrews 1) are provided with pinions n, engaging an annular rack 17.",seated revolubly in a groove concentric with the axis of the body A. Byturning one of the screws 1) the pinions and rack cause all the screwsto turn simultaneously and the carriers 0 C C to move toward or from theaxis of the body.

Although I prefer the aforesaid devices for adjusting the jaws, yet I donot wish to be limited to the employment of the same, inasmuch as otherwell-known devices will answer the pu rpose-as, for instance, an annularplate P, seated revolubly in a recess in the body A and formed with ascroll-shaped rib P on its upper surface and with an annular rack P" jon its periphery, as shown in Figs 8 and 9 of the drawings. The rib Penters a groove in the bottoms of the carriers 0 O O, and by means of aworm-shaft R, journaled in the chuck-bodyA tangentially to the rack P"and engaging the same, the plate Pcan be turned in either direction, andin this movement the engagement of the rib P with the grooves in thecarriers 0 O 0 causes the latter to approach or recede from the axis ofthe body A.

Each of. the aforesaid carriers 0, Iform with a groove 0 in its innerface, whichgroove is segmental-shaped in cross-section and larger than asemicircle, for the purpose hereinafter explained.

D D D represent the jaws by which the chuck grips the drill or work tobe secured to the chuck. Each of these jaws I form with asegmental-shaped back D, corresponding to the groove 0 of the carrier,into which groove 8 5 the jaw is inserted endwise and is fittedrevolubly therein. The wall of the said groove, embracing more than halfof the segmental back of the jaw, serves to prevent the jaw from fallingout from the carrier toward the 90 axis of the chuck. To restrain thejaw from moving endwise out of the carrier, I provide the back of thejaw with a transverse groove 6 and drill transversely through thecarrier a hole, into which I insert a pin (1, which passes 5 through thegroove 6, as shown in Figs. 4, 6,

and 8. In order to facilitate and cheapen the operation of forming inthe end of the carrier 0 the groove 0, in which the jaw D is seated, II00 prefer to cut said groove from end to end of the carrier, asrepresented in Fig. 4 of the drawings.

The face of the jaw is formed eccentric in relation to the axis of thejaw and is serrated or formed with fine teeth to afford a secure hold onthe drill or work to be secured to the chuck.

In operating the described chuck the jaws D D D are first turned topresent to the drill the portions of the jaw-faces which are nearest tothe axes of the jaws, and then the carriers O O C are moved in to bringthe jaws in contact with the drill to be held. The lathe being then setin motion and the drill brought to bear on the article to be drilled,causes the jaws D D D to be partly turned on their axes by the straintransmitted from the drill to the jaws, and the turning of the jawscarries more eccentric portions of the faces thereof toward the drill,and thus strengthens the hold of the jaws on the drill.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is-

The combination, with the chuck-body provided with radial ways a a a, ofthe carriers 0 O O, seated in said ways and formed at the inner endswith the segmental grooves c c 0, larger than a semicircle and extendingfrom end to end of the carriers, the jaws D D D, formed withcorrespondingly segmentalshaped backs and seated thereby in theaforesaid grooves and provided with the transverse grooves e e e, andthe pins (Z d 02, passing through the carriers and through the groovesin' the jaws, substantially as described and shown.

In testimony whereof I have hereunto signed my name this 6th day ofOctober, 1891. 40

JAMES H. WESTCOTT. [11. s] Vitnesses:

MARK W. DEWEY, II. M. SEAMANs.

